Improvement in boring-machines



` wie' )L WILLLaMTUcKEn, of Fiskedale, in' the county of `Worcesterland State of'Massachusetts, `have invented an Improved Boiin following is a specification.

Na mul Objcctsof theliwenmi. The device f is a portable ,wooden boring-machine, such asu'sed by carpenters for mortising andislotting `tirriberpthe augerbeingrnounted in a sliding gate in an uprightfrarneandj actuated through a pair of hand-Y ,crankswu a horizontal driving-shaft geared to and traversing'vertically with the auger. 1 The inveutionconsis'ts,fiirstly, in employing Va pair of driving-gearson the crank-shaft, respectively con- "nected thcretoxn opposite movements, so as to cause a forward rotatioupf the auger to be produced by the movementzof `the cranks in eitherdirection. i i '.lhe objectof this partof `the invention is tokenable the workman 'toiusfe his' strength.economically, j byapplyingit int-l ostadvantageons manner,iand

i to `pernlitfof `change ot position` andjmotionn j e invention"ihrtheruconsists ina peculiar con- `stru ionot` clutch` for attaching the driving-gears to their shaft, the.` 1e being f superior simplicity and compactness: Y i yAlso,infaimeansforlo toenablethea er g-Machine, of which the ingfthe"driving-gear so as betnrned: backward when i deftheldccoi yang/'ing Drawing. ation ofmyimprovedhorra cal form..

i ing-machi ei `Figure i linea@ i f Figure `e'ction fon, the line Q/ y, `fg.1`.A .f `e perspective views of parts of g-gear detached and on alarger t' referenc `indicate like parts `in efercnce to the Drawing. f Theframe of my m ov dniachine may be` of customary form, havingga base,1A, extended forward to i `formaseat forthe operator, and recessed, a, at its i `rear end to exp' Vthel work `onwhich it rests,a`nd an upright, frame, i rectedpover "this `aperture to "confstitut guidefand supp tfora gat-e, 0, inwhich they d its operating devicesaremounted., l auger-,hit ,Dl is securedby a setlscre v, e, or its eqniva ent-,fin asocket he `lower end'iof a ver-v ticalshaft,` F, mounted 1 `e gate'Q-and `receives its `In@ nthroughsaidisha v on itsnpper end from orizonta-l --driving-shaft, H,

nsaidgate,a r

` ftl'he Schedule referred to in `these Letters Patencand making Vpart 'ofl the same V a v r,- al longitudinal section onthe v 1 l `and the face of' the gear J behind it with socketsj'forf nd a tightbevel-gear, G,

warfare.'

` wItmitrrUcKE-n) orl mentionne, Massacausnrrs i i `v Letters PatentNo;104,797,daezllan, 1870. y i i l y -I- n- IMPRVEMBNT :NBQRING-MACHINES;

opposite sides, and is arranged at such distance above' the upper end of the bit-shaft l as` to accommodate proper-si`zed driviiig-gears. m

For conveying the motion ofthe dri`ving-shaft H, l .I arrange thereon,facing' eachother and meshing with the bevelfgear G on the hit-shaft F, two loose gears, j

J` J', which are respectively connected tothe said shaft in different movements asuitahle clutch arr. ngement-being employed for fthis" latter purpose, which may be as follows:

Attached to the drivingshaft `A,lbetweenrthe` gears faces of the gears J J', which are provided wit-h lugs j, (one or more,) beveled in` opposite directions for` their engagemenhbeing adjusted to'secure the im ward movement of the bit, as required.

It will ber se'en that, on turning the cranks in either' direction, a forward motion will be conveyed to' the bit through one or the other of the gears; lThe cranks,I j moreover, need not be rotated, but may be oscillated w within the most effective portions of their paths, thus enabling the operator to avoid disadvantag'eous points, and in this manner to economize his strength.

To provide for backing the `bit by means` ofthe cranks, 4when desired, as `in withdrawing l, the gimletd` pointof a bit `from 'the wood, `Iprovide one of the clutch-pins L L' with a transverse 4pin-` or handle, l,

the reception of its stem. By` forcing tlie saidclutchpin back into one of thesaid, sockets the J connection is leverserhand by turning then cranks` backward, a

backward mot-ion will be imparted to the bit. No ,special means are required forretaining this -connec` tion. The binding pressure on the pin-incident to the resistance ofthe bit is sufficient.` Any suitable means may, however, be provided, if deemed preferabie. l

. For withdrawing'or elevating the' bit amovablelon-` gitudinal rack, M, is provided on the inner face of one Y ofthe uprghts of theframe being held by screws m passing through heart-shaped slots m', (two `or.rn3}e,)`

and Ytheadjoi'ning gear J of the driving-gears is constructed with a pinion,N, on its hub, adapted to `byits gravity. By shifting it so thatthe lopposite ends ot' its slots shall receive-the screws, the vsame force tends to hold it in mesh with the said pinionvN,

the engagement ot' which, in the rotation of the cranks, elevates the gate G and its.appurtenancesraising the` -bit clear of the work.

A spn'nf,Y catch, O, atlthc top ofthe frame, may enable the gate to be temporarily retained it its elevated position.

1 It will be observed that, owing tothe constant mesh* of both the driving-gears J J with the gear G on the bitlshait iu the arrangement represented, the motion of the handles is imparted to the elevating pinion N in the same manner as tothe bit.

The several features of theinveution may, of course, be used separately, and are obviously susceptible of numerous modifications in unessential particulars.

Claims.

I claim as newl. In combination, with the crank-shaft H, bit-shaft F, and bit-shaft gear G, of a portable boring-machine,

substantially as herein referred to, the two drivinggears J J adapted to operate as described, for thepur'- pose set forth.

2. The combination of the pair of driving-gears J J mounted loosely in a common shaft, H, the central fast stock K k, spring clutch-pins L L', and beveled lugs j, all constructed and arranged to operate substantially as set forth, for the purpose shown.

3. The combination, with the driving-gears J J and the clutch-pins L L of the reversing handle l" and sockets j', formed and arranged substantially as represented and described, for the purpose 'set forth.

. WILLIAM TUCKER. Witnesses:

'- I?. A. SHELL,

GEORGE G. HoLL-ar. 

